POLYCHAETE WORMS, PART 1 



151 



Lycastopsis avgeneri Okuda, 1937a, p. 306, fig. 2. — Uschakov, 1955, p. 204, figs. 



62, a-d. 

 Lycastopsis tecolutlensis Rioja, 1946, p. 211, pi. 1, figs. 7-12. — Hartman, 1951, p. 



44. 

 Namanereis quadraliceps Hartman, 1959b, p. 162 (part?). 



Description. — Length up to 57 mm., width up to 1 mm., segments 

 up to 125. Body slender, stiff, turgid, widest in the middle, tapering 

 toward both ends, flattened ventrally, strongly arched dorsally. 

 Prostomium (fig. 416) subovai, wider than long. Frontal antennae 

 short, conical. Biarticulate palps short, thick. Two pairs of eyes on 

 posterior half of prostomium, anterior pair larger. Tentacular seg- 

 ment achaetous, about same length or slightly shorter than the follow- 

 ing segments; it may overlap the posterior part of the prostomium, 

 concealing the posterior pair of e3^es. Tentacular cirri 3 pairs, without 

 basal joints, short, not extending beyond the palps, \videst basally, 

 tapering distally. 



Parapodia (fig. 41f/) conical, essentially uniramous. With a dorsal 

 aciculum, without notosetae, with ventral aciculum. Compound 

 neurosetao of 2 kinds: few (2-3) heterogomph spinigers and more 



Figure 41. — Nereidac, Lycastopsis pontica: a, habit, sketch; b, dorsal view anterior end; 

 c, dorsal view posterior end; d, parapodium; e, neurosetae, compound heterogomph 

 spiniger and falciger. 



